The boy in the story is Alvin and the girl is Lisa. They met when those two cars were next to each other.
The girl thinks that the boy is nice and the boy thinks that the girl is nice because she has that thing around her neck, which means she just got groomed.
They are not talking to each other. They both feel kind of shy about meeting each other, but they will talk to each other when they feel less nervous.
When the light turns green, they will go off in their own cars, but they will have talked by then. They will have said the things that people say when they first meet.
What if they fall in love one day? Maybe what will happen is someday, Alvin's owner will decide to adopt Lisa and Lisa will have babies at Alvin's house and they will turn into a family, like the dalamation dogs.
And they'll just live until they die and their soul goes to heaven.